Eduaed rubin



(Model.)

B. RUBIN.

BARREL FOR FIRE ARMS.

Patented Mar. 16-, 1886.

IN VENTOR WITNESSES: H ATTORNEYS.

UNITED STATES PATENT Fries.

EDUARD RUBIN, OF THUN, SWITZERLAND.

BARREL FOR FIRE-ARMS.

SPECIFICATION forming part of Letters Patent No. 338,192, dated March 16, 1886.

Application filed June 14, 1884. Renewed January 11, 1886. Serial No. 188,237. (Model) To all whom it may concern:

Be it known that I, EDUARD RUBIN, of Thun, in the Republic of Switzerland, have invented certain new and useful Improvements in Barrels for Fire-Arms, of which the follow ing is a specification.

My invention relates to improvements in rifle-barrels; and it consists of a barrel having grooves vanishing at their rear ends into a smooth portion of the same diameter,-which forms the front part of the cartridge-chamber. The diam eter of the cartridge-chamber is larger than that of the rifled portion of the barrel and connected therewith by an intermediate conical and a short cylindrical portion.

In the accompanying drawings, Figure 1 is a vertical longitudinal section of a rifle-barrel embodying my invention; and Figs. 2 and 3' v maybe used in connection with any approved breech closing and repeating mechanism. The bore has a diameter of from seven and fivetenths millimeters to eight millimeters, and is provided with from three to six grooves, a a, of a depth of 0.15 millimeters. The width of the grooves and the intermediate spaces are equal to each other. The grooves a a make one turn for alength of two hundred and seventy to three hundred millimeters. The grooves a a vanish at their rear ends, as

shown at b in the drawings, into a smooth rear end, (i of the rifled portion, which has the same diameter as the rifled portion, and which forms the front part of the cartridge-chamber B. The twist of the grooves may be uniform or gaining.

It will be evident that rifle-barrels in which the rifles gradually "anish at their rear ends can be more readily cleaned.

The main part d of the cartridge-chamber has a larger diameter than that of the rifled portion of the barrel A, so as to admit a comparatively large charge of powder in the cartridge.

The comparatively small bore of my gun (about 0.31 inch) admits the firing of long projectiles with heavy charges without serious recoil, even with light weapons. The heavy twist of the grooves imparts to the ball a very considerable rotation, so as to prevent deviations from the trajectory.

To prevent the stripping off of the lead projectile by the edges of the grooves, I prefer to use cartridges the projectiles of which have a copper or other sheathing-such as described in a separate application for Letters Patent filed at the same time herewith, to which reference is made.

Having thus described my invention, I claim as new and desire to secure by Letters Patent A rifle-barrel consisting of a rifled portion, A, having grooves a a gradually vanishing at their rear ends in a smooth portion, 01'', of the same diameter as the curve of the lands of said rifled portion, and of a cartridge-chamber, B, formed of an enlarged cylindrical main part, (1, a short ,cylindricalportion, d", slightlylarger than and just in the rear of said portion d, and a conical portion, d, connectingsaid parts (1 and d, substantially as described.

In testimony that I claim the foregoing as my invention I have signed my name in presence of two subscribing witnesses.

' ED. RUBIN. Witnesses:

N. YERBE, R. MULTZ, Gas-Director. 

